I use the following code to define my persistent entity classes in
JDO.
I have find my persistent entities by encoded key string or ID - my
choice.
Enjoy?
@PersistenceCapable(identityType = IdentityType.APPLICATION,
detachable = "true")
public class MyPersistentClass implements Serializable
{
private static final long serialVersionUID = 1L;
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
@Extension(vendorName="datanucleus", key="gae.encoded-pk",
value="true")
private String sEncodedKey;
@Persistent
@Extension(vendorName="datanucleus", key="gae.pk-id", value="true")
private Long loID;
//
// Other persistent data members...
//
public String getEncodedKey()
{
return sEncodedKey;
}
public Long getID()
{
return loID;
}
//
// Getter and setter methods for
// the other persistent data members...
//
}
On Apr 5, 3:44 pm, Luca Matteis <lmatt...@gmail.com> wrote:
> To identify my JDO objects in Google App Engine I use the Key type. It
> works fine but when I need to pass this through urls it gets sort of
> long.
>
> For
> example:http://mysite.com/user/aghtaWx1LWFwcHIZCxIGTXlVc2VyGAMMCxIHTXlJbWFnZR...
>
> When viewing my entities in my admin viewer I can see that the
> data-store also sets an "id" for my entity object, which seems to be
> an incremental numeric value, which is quite short compared to the Key
> string. Can I use this to grab information on my object? How do I do
> this? I tried using getObjectbyId() with the id instead of the key...
> it doesn't work.
>
> Also, should I be using a Long type to identify objects instead of Key types?
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